The Usage of It

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1、TheUseof“it”I代词it1.用作人称代词，代替前文提到过的事物。Mypenismissing.Ican’tfinditanywhere.Thesnakeisnotawarm-heartedanimal.It’sacold-bloodedone.Jackisill.Haveyouheardaboutit?2．用以代替指示代词this,that。---What’sthis?---It’saflag.---Whoseexercise-bookisthat?---It’shers.3．表示时间、天气、距离

2、、季节、环境、情况等。It’stimeforlunch.(时间)Whattimeisitnow?It’ssixo’clock.Whenspringcomes,itgetswarmerandwarmer.(天气)It’sabouttwolifromheretothezoo.(距离)It’swinternow.（季节）Itwasveryquiet(noisy)atthemoment.（环境、情况）Itwassnowinghard.II引导词it1．作形式主语，代替由不定式（或不定式复合结构）、动名词或从句表示的

3、真正主语。Hehadtositupnow,foritwasimpossibleforhimtosleep.It’snousetellinghimthat.It’snotyetknownwhereshehasgone.2．作形式宾语，代替由不定式、动名词或从句表示的真正宾语。Hefeelsithisdutytohelpothers.Wethoughtitnousedoingthat.Theywanttomakeitcleartothepublicthattheydoanimportantandnecessar

4、yjob.Willyouseetoitthattheluggageisbroughtback?3．用在强调结构(EmphaticStructure)中。为了强调句子的某一成分（通常是主语、宾语或状语），常用强调结构“Itis(was)+被强调成分+that(或who)…”如：IsawLiPinginthestreetthismorning.可用强调结构来分别强调句中的主语、宾语、地点状语和时间状语。ItwasIthat/whosawLiPinginthestreetthismorning.ItwasLiPi

5、ngthatIsawinthestreetthismorning.ItwasinthestreetthatIsawLiPingthismorning.ItwasthismorningthatIsawLiPinginthestreet.注意：（1）被强调的部分如果是原句的主语，后面的谓语在人称和数上应和原句的主语一致。Itishethatisright.8Itistheythatareright.（2）此句型只用于现在时和过去时态。（3）强调时间状语和地点状语时后面不能用when和where引出其余部分，必须

6、要用that引出。ItisLiPingthatisournewmonitor.Itwasyesterdaythatweheldthatparty.ItwasintheparkthatImetmyfriend.（4）强调notuntil结构时将此结构置于Itis(was)…that…句型中，that后接肯定式。Ididn’tgotobeduntilIhadfinishedmyhomeworklastnight.ItwasnotuntilIhadfinishedmyhomeworklastnightthatIw

7、enttobed.（5）强调句型的一般疑问句将be的形式提前于句首。Wasithethat(who)knockedatthedoorjustnow?（6）特殊疑问句句型，将被强调的疑问词置于句首。Whatisitthatyouwantmetobuyasyourgift?Whowasitthatknockedatthedoorjustnow?Wherewasitthathewentyesterday?IIISentencesWith“It”(It句型的归纳)除上文谈到的强调句型，It还有很多其它句型，这些句型

8、在英语中很常用。下面仅就书面表达中经常能用到的it句型进行归纳：1.It+be+adj.+ofsb.+不定式sb.+be+adj.+不定式Itwaswiseofyounottoaccepttheinvitation.Itisverykindofyoutohelpus.(=Youarekindtohelpus.)It’scruelofhimtokillthatanimal.Notes:这种结构中的形容词表明的是不定